Sunday, August 17, 2008

Using "Sistema koordinat 1942" with Garmin GPS

The GPS setup is a bit non-exact, giving differences against OziExplorers S-42 setup between 2-10 m. This should pose no problem for "where am I on the map", however.

How to setup an eTrex Legend:
Setup/Units/Position format = User UTM Grid, data same as in OziExplorer, so:
Longitude origin E45 deg
Scale: 1.000
False easting: +8 500 000 m
False northing: 0 m

Map datum = User
I used setup for Kazakhstan from the wgs84fin report:
dx = +15 m
dy = -130 m
dz = -84 m
da = -108 m
df = 0.00480795

Values here depend on where you are, see pages 120 and 121 of the mentioned report.
Errors/differences from what OziExplorer states as User grid coordinates vary depending on where the point is.

Posted by Václav Štěpán at 3:53 AM

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